Tool-holder.



A. T. DUNCAN.

TOOL HOLDER. APPLICATION FILED rm. 1a, 1911.

1 ,OO8,0221 Patented Nov. 7, 1911.

u J7 J7 Z] i7! Attorneys ARTHUR '1. DUNCAN, 0F CLINTON, MISSOURI.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Nov. 7, 1911.

Application filed February 15, 1911. Serial No. 608,736.

To all whom it may concern;

Be it known that I, ARTHUR T. DUNCAN, a citizen of the United States,residing at Clinton, in the county of Henry and State of Missouri, haveinvented a new and useful Tool-Holder, of which the following is aspecification.

It is the object of this invention to provide a holder for lathe tools,so constructed that the tool may readily be removed from the holder,without disturbing the adjustment of the holder in the tool post, thedevice being adapted to retain tools of all standard shapes.

W'ith the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of invention herein disclosed can be made within the scope ofwhat is claimed without departing from the spirit of the invention.

In the drawings,Figure 1 shows the invention in perspective, a toolbeing mounted therein; Fig. 2 is a side elevation of the body of thetool holder, the removable jaw being displaced; Fig. 3 is a top plan ofthe tool holder, the removable jaw being assembled with the body of thetool-holder; Fig. 4 is an elevation of the removable jaw, showing theinner face thereof; Fig. 5 is a side elevation of a modified form of theinvention; and Fig. 6 is a top plan of the device depicted in Fig. 5.

The tool-holder shown in Fig. 1 comprises a body 1 provided at one sidewith a primary shoulder 2, the end face of which is inclined at an angleto the longer dimension of the body 1. Adjacent the primary shoulder 2,a supplemental shoulder 3 is formed, the end face 1 of which is disposedat an angle to the end face of the primary shoulder 2. The outer, sideface of the supplemental shoulder 3 is spaced inwardly from that face ofthe holder 1 in which the shoulder 2 is formed.

In the inner face of the body 1, adjacent the extremity thereof, thereis a groove 5, disposed diagonally with respect to the longer dimensionof the body 1, this groove 5 intersecting an inclined end face 6, formedby cutting off one corner of the body 1. Upon either side of the groove5, there are openings 7, extended through the body 1.

The invention further includes a removable jaw, denoted generally by thenumeral 8. The aw is supplied with an inclined end face 9, correspondingto the inclined end face 6 of the body 1. The inner face of theremovable jaw 8 is provided with a diagonally disposed groove 10,adapted to cooperate with the diagonal groove 5 in the body 1, thegroove 10 intersecting the inclined end face 9 of the removable jaw. Therear end face of the jaw 8 is inclined at an angle to the longerdimension of the jaw, in order to mate properly with, and to engage, theend face of the primary shoulder 2, the rear end face of the removablejaw 8 being denoted by the numeral 11. Adjacent one corner, theremovable jaw 8 is supplied with an opening 12, there being otheropenings 141, disposed upon opposite sides of the groove 10 in theremovable jaw.

The opening 12 in the removable jaw 8 is adapted to be engaged by a pin15, outstanding from the supplemental shoulder 3, and screw bolts 16, orother securing elements appropriate to a like end, are adapted to bemounted in the openings 14 and 7, these openings alining with eachother.

In the form of the invention shown in Figs. 5 and 6, the tool holderembraces a body 17, slotted at one end to form jaws 18, one or both ofwhich may be yieldable. The jaws 18 are supplied with inclined end faces19, corresponding to the end faces 6 and 9 of Fig. 1. The jaws 18 aregrooved as at 20, to receive the tool, and a screw bolt 21, or otherretaining element, is employed for se curing a proper cooperationbetween the jaws 19. Into the tool holder above described, a tool,denoted generally by the numeral 22 may be mounted. This tool 22 is ofthe same cross sectional area throughout its entire length, and thecross sectional area of the tool may be varied as desired, the groovesinto which the tool is received, of course being shaped to correspondwith the cross sectional contour of the tool. The tools 22 areterminally beveled, as shown at 23, to-

tool ren'iaining unchanged. Practically the entire length of the toolmay, therefore, be made effective, by simply grinding off the beveledface 23, the grinding being accomplished more easily than would bepossible, were the tool ground upon the sides.

By reason of the fact that the tools in all forms of the invention,protrude through the end face of the body of the tool holder, the thrustof the material against the tool, comes directly against one end of thetool, and by reason of the fact that the tool holding grooves intersectthe end face of the holder, the thrust of the tool is against the end ofthe holder. The chance of breaking the tool is, therefore diminished,and the mounting of the tool in the holder is made more secure.

The tool holder shown in Fig. l is adapted peculiarly for the use ofthreading tools and tools of other irregular shapes, and theconstruction is such that the tool may be removed from the holder, besharpened, and be mounted again in place in the holder, without changingthe relative positions be tween the tool and the work in hand.

The supplemental shoulder 3 serves to space the removal jaw 8 from thebody of the tool holder, so that a proper cooperation of the jaw and thebody of the tool holder may be secured by manipulating the securingelement 16. The pin 15, registering in the opening 12 in the removablejaw 8, serves to aline the openings let in the removable jaw 8, with theopenings 7 in the body 1 of the tool holder. When the openings 7 and letare thus alined, the securing elements 16 may be inserted into thealined openings.

Having thus described the invention, what is claimed is 1. In a toolholder, a body provided at one side with a primary shoulder and with asupplemental shoulder adjacent the primary shoulder; a removable jawabutting terminally against the end face of the primary shoulder andabutting laterally against the side face of the secondary shoulder tospace the jaw from the body; and means for SGCLII'lD a C06 aerationbetween the 'aw and the body.

2. In a tool holder a body provided with a primary shoulder and with asupplemental shoulder disposed adjacent the primary shoulder; aremovable jaw adapted to rest terminally against the end face of theprimary shoulder, and to rest laterally against the side face of thesupplemental shoulder, the jaw being connected with the supplementalshoulder by a pin-and-opening con nection, the supplemental shoulderconstituting a means for spacing the jaw from the body of the toolholder; and means for securing a cooperation between the aw and thebody.

3. In a tool holder, a body provided with a primary shoulder and with asupplemental shoulder disposed adjacent the primary shoulder; and aremovable jaw adapted to rest terminally against the end face of theprimary shoulder, and to rest laterally against the side face of thesupplemental shoulder to space the jaw of the body, the jaw and the bodybeing provided with in clined end faces disposed at an angle to thelonger dimension of the body, there being mating grooves in the adjacentfaces of the jaw and of the body, the grooves being extended through theinclined faces; and means for securing acooperation between the jaw andthe body.

4. In a tool holder, a body provided at one side with a. primaryshoulder, and with a supplemental shoulder disposed adjacent the primaryshoulder; a removable jaw adapted to rest in terminal abutment againstthe end face of the primary shoulder, and to rest in lateral abutment,against the side face of the supplemental shoulder to space the jaw fromthe body, the aw being united with the supplemental shoulder by apinand-opening connection; the jaw and the body being provided with endfaces disposed at an angle to the longer dimension of the body, therebeing in the adjacent faces of the aw and of the body, cooperatinggrooves intersecting the angularly disposed faces; and means forsecuring a cooperation between the jaw and the body.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature in the presence of two witnesses.

ARTHUR 'l. DUNCAN.

Vitnesses lV. M. STEVENS, W. A. HAs'rAm.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C."

